PbO-V<sub>2</sub>O<sub>5</sub>系の相関係と系内生成化合物

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タイトル別名
  • Compound Formation and Phase Relation in the System PbO-V<sub>2</sub>O<sub>5</sub>
  • PbO-V2O5ケイ ノ ソウカンガカリ ト ケイナイ セイセイ カゴウブツ

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説明

Amadori's result of the phase diagram PbO-V2O5 are re-examined. Solidus and liquidus points of the various mixtures heated in a micro-furnace were determined with the naked eye through a binocular microscope.<br>In addition to 8PbO⋅V2O5, 3PbO⋅V2O5 and 2PbO⋅V2O5, they have already been reported, a new incongruent compound having a molecular formula of 4PbO⋅V2O5 was identified.<br>Four eutectic compositions occur at 7.3% (mole) V2O5 (761°C), 16.5% V2O5 (760°C) 31.7% V2O5 (725°C) and 50% V2O5 (502°C).<br>Although the 8PbO⋅V2O5 crystals might have pseudo tetragonal symmetry having unit cell dimensions of a=5.316Å and c=5.694Å tentatively, but unit cell dimension having a=5.65Å, b=10.71Å, c=7.47Å and β≅90° with monoclinic symmetry are obtained by oscillation photographs of the single crystals.<br>The number of fomula units in this monoclinic lattice were almost unity.<br>Although distorted hexagonal lattice having unit cell dimensions of a=5.78Å, c=20.47Å and c/a=3.53 are postulated for 3PbO⋅V2O5, unit cell dimensions of 4PbO⋅V2O5 and 2PbO⋅V2O5 are indeterminate yet.

収録刊行物

  • 窯業協會誌

    窯業協會誌 75 (868), 352-358, 1967

    公益社団法人 日本セラミックス協会

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